The Series UDL Universal Input Data Loggers are available with 0, 2, or 4 universal inputs. Each universal input can be individually configured to accept a thermocouple, RTD, thermistor, voltage, or current input. All Series UDL data loggers have an internal temperature sensor and a digital input which can be used as a trigger to start logging or as a pulse counter for interfacing with flowmeters or other sensors with a pulse output. Optional features include an internal humidity sensor, an LCD display, and an external humidity and temperature sensor. The Series UDL loggers interface to the USB port of a PC. The unit includes software, USB connection cable and installed battery.